title: Evidence of ammonium ion-exchange properties of natural bentonite and application to ammonium detection.
abstract: Ammonium exchange with hybrid PVC-bentonite (mineral montmorillonite clay) thin film was revealed using FTIR spectroscopy, EDX, cyclic voltammetry and electrochemical impedance spectroscopy. The effect of ammonium exchange on the charge transfer resistance of PVC-bentonite hybrid thin film was attributed to a modification of the intersheet distance and hydration of bentonite crystals. The obtained impedimetric ammonium sensor shows a linear range of detection from 10(-4)M to 1M and a detection limit around 10(-6)M.
authors.affiliation: Université de Jijel, Laboratoire de Matériaux: Elaborations-Propriétés-Applications, BP 98, Ouled Aissa, 18000 Jijel, Algeria. Electronic address: azazoua@yahoo.fr.
authors.forename: A
authors.initials: A
authors.lastname: Zazoua
authors.forename: I
authors.initials: I
authors.lastname: Kazane
authors.forename: N
authors.initials: N
authors.lastname: Khedimallah
authors.forename: C
authors.initials: C
authors.lastname: Dernane
authors.forename: A
authors.initials: A
authors.lastname: Errachid
authors.forename: N
authors.initials: N
authors.lastname: Jaffrezic-Renault
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis*; D001546:Bentonite / Q000737:chemistry*; D058266:Dielectric Spectroscopy; D004573:Electrolytes / Q000737:chemistry; D007474:Ion Exchange; D007477:Ions / Q000737:chemistry; D011143:Polyvinyl Chloride / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D064751:Ammonium Compounds; D004573:Electrolytes; D007477:Ions; D001546:Bentonite; D011143:Polyvinyl Chloride
keywords: Ammonium; Bentonite; Electrochemical sensors; Ion-exchange